Apparatus for corroding and drawing lead.



E. C. BERSCH.

APPARATUS FOR CORRODING AND DRAWING LEAD.

APPLICATION FILED APR-24.19l3- RENEWED MAR. 11,1916.

Patented Oct. 24 1916.

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APPARATUS FOR CORRODING AND DRAWING LEAD.

APPLICATION F|LED.A PR.24. I913- RENEWED MAR. II, l9l6.

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Application filed April 24, 1913, Serial No. 763,259. Renewed March UNITED STATES P TENT OFFICE,

EMIL e. Benson, or CHICAGO, ILLINOIS, ASSIGNOR or ONE-HALF 'TO FRANK A. ros'r, or CHICAGO, ILLINOIS.

APPARATUS FOR CORRODING ANDY DRAWING LEAD.

To all whom it may concern:

Be it known that I, EMIL C. BERSOH, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Apparatus for Corroding and Drawing Lead, of which the following is a specification. 1

The main objects of this invention are to provide separate receptacles for the lead and the corroding acid, to prevent the lead from accidentally dropping into the acid and thereby becoming moistened and making diflicult the further treatment of the lead; and also to permit separate handling of the lead and acid receptacles; to provide means permitting improved ventilation in corroding stacks whereby corrosion may take place uniformly throughout the stacks and the lead will therefore not be discolored, due to the formation of red lead, which makes necessary the separation of the red lead from the white lead; to provide an improved construction of corroding pots whereby they may be removably secured to supporting trays, and these traysmay be handled mechanically in forming or stripping the corroding stacks and thereby make unnecessary manual handling of corroding pots; to provide means for keeping the lead entirely free from tan-bark and out of contact with the boards of the stacks, thus preventing discoloration of the lead and making unnecessary the further step of separating it from the tan bark; and to provide a tray suitably constructed so that the lead compartment may be independently handled by a car or bucket particularly adapted to handle a tray of corroded lead, without the escape of dust, for the purpose of transporting the lead from the corroding stacks and dumping it into the receiving hoppers.

An illustrative embodiment of this invention is herewith shown in the accompanying drawings in which: Figure 1 is a side elevation of a hood or bucket adapted to be secured to a tray for supporting corroded lead and transporting said tray and dumping the lead therefrom. Fig. 2 is an end view of the device shown in Fig. 1. Fig. 3 is a bottom plan of the hood or bucket shown in Fig. 1. Fig. 4 is a transverse verticalsection taken on the line AA of Fig. 1. Fig. 5 is a fragmentary sectional Specification of Letters Patent.

7 Patented Oct. 24, 1916.

11, 191s. Serial No. 83,677. view of a corroding tray. Fig. 6 is a fragmentary plan view of the lower part of the corroding tray showing one of the corroding pots removedtherefrom. Fig. 7 is afragmentary tray.

The process of corroding small bars or buckle-shaped pieces of lead for the purpose bark, layers of earthenware pots designed to receive a certain proportion of acetic acid bottom plan of the corroding l of converting them into the white lead of and small pieces of lead supported above the l acid and presentingconsiderable surface to be acted upon by the fumes and heat of the acid and the tan bark.

After a certain length of time the lead is in condition to be removed from the stacks, but it may be unevenly corroded due to poor ventilation of the stacks because of their great weight and whereby the corroding pots are forced into the tan bark unevenly and closing some of the air passages intended for providing a circulation through the stacks. In this process the lead may come into contact with the tan-bark and'be thereby discolored, but the worst feature of the process is that it involves the manual handling of the pots for the purpose of dumping the lead therefrom into carriers by which it is transported to separating devices. This drawing the lead from the stacks is one of the most dangerous steps in the manufacture and working of white lead, due to the workmen breathing more or less of the dust and coming into contact therewith. Vacuum systems may be provided for removing the dust from the air, but it is preferable to wholly. prevent the escape of dust and it is to accomplish the latter end that the present invention is particularly designed.

Briefly the present invention provides suitable trays for supporting corroding pots bark is kept free from lead dust there is little danger to the workmen in the building of the stacks. The danger is particularly 65 It consists in stacking in layers of tanin tearing down the stacks'and removing the corroded lead therefrom. This danger is overcome'iiby .l'employing the trays of the present invention, in connection witha cover therefor which may be lowered on the trays and secured to them" and then-mechanically hoisted, transporting'the trays and dumping them into receiving hoppers Without allowing the escape of dust or requiring manual handling of the corrod-ing pots.

Referring tothe drawings, a tray 1 for supporting corroding pots 2 is shown in 'Figs. 5, 6 and 7. These pots may be of the usual construction but it is preferred to have them of'only'sufficient depth for containing the acetic acid. "The lead buckles may rest in stacks on the tops of the pots 2,

or if desired'the buckles maybe supported 'entirelyfree from the pots by means of a screen 3 dividing the trays 1 into'two compartments. If desired the screen may be separable into two parts on the line of the screen 3 and the latter secured to the upper part 4, and therefore permit the part 4 of the traywhich contains the lead to be handled separately from the part 5 or grating in which the cups 2 are seated. The part 4 of the tray has cut away parts 6 at its top, and the grating 5 of'the tray has rectangular openings 7 these 7 openings 6 and 7 providing for suitable ventilation between'the layers of trays 1 and also permitting the fumes of the acid to freely come into contact with the lead buckles. The trays 1 are also preferably provided with transverse walls 9, to prevent the stacks and buckles from falling and thereby possibly coming into contact with the acid in the cups, in case the screen 3 is omitted and the trays made in singlelparts.

The corroding pots 2 are preferably circular in horizontal section, and are provided with lugs'S. The lugs 8, by cooperating This device comprises a hopper shaped hood which may be secured to the lead compartment of a tray, lifting the same out of a stack, transporting it as desired, and dumpingit without the escape of lead dust. This device forms no part of the present invention, but in order that the purposes of the invention may be fully understood, the handling-and dumping device is herein briefly described. f j

hood 10,'hav'ing its'bottom 11 open, is

adapted to fitov'er the side walls of tray 1 and then to be secured to the tray so that it may lift it outof a corroding stack an'd "transport it to receiving hoppers for the corroded lead. The "hood 1.0 is pivotally mounted by ineanso'f stub shafts 12 to a frame 13hung by a chain 1-1 from a suitable traveling device mounted on cables. 7 The stub shafts 12 pass through sprocket wheels 15, no'n-rotatably mounted- 1 on the hood and having a chain connection 16 withsprocket wheels 17 on a shaft 18 journaled in the frame 13. The shaft 18 is provided with square ends 19 to which keys may be fitted for the purpose of rotating the shaft "and thereby turning the bucket 10 in the frame 13 for the purpose of dumping the corroded lead. To thisjend the bucket 10 is provided with a pair of hinged doors 20 connected to the body part of the bucket by hinges 21, and together at their ends by a latch 22 on onedoor, cooperating with a lug 23 on a small flap 2 1, secured to the opposite door by a hinge 25. This flap 24 is provided for the purpose of preventing the escape of lead dust from between the doors 20. Mounted at one side of the bucket 10 is a pivoted arm 26 connected by a cord or wire 27 with the latch 22. Thus when the bucket 10 is in its inverted position, as indicated by the broken lines 28, (Fig. 2) the lowering of the bucket into the lead receiving hopper will result in the arm 26 engaging the side of the hopper and thereby operating latch 22 to release thedoors 20.

The doors will then swing apart by their own weight, and allow the corroded lead to drop into the hopper. I

The means for fastening the hood 10 to the trays 1 includes a plurality of latching arms 29 fast to short shafts 30 journaled in brackets 31 secured to theside walls 32 of therhood 10. The latches are adapted to be locked below the edges of the bottom of tray 1 when the hood is in position over the latter,

'or if it is desired to handle only the upper compartment t of the tray, the latter is provided with cut away parts 10 in which the arms 29 may enter. Each shaft 30 carries rigidly a smallworm wheel 33 meshing with in brackets 36 secured to the hood 10. The shafts 35 are provided with square ends 37 to which keys may be applied for the purpose of rotating the shafts andthereby operloo a worm 34 on one of the shafts35 journaled ating the latching arms 29. Thus a plurality of these arms may be operated at onetime by, rotating one of the shafts 35.

In the operation of the device, the stacks are stripped to expose a layer of trays 1, and

the hood 1.0 is successively lowered and attached to the trays transporting them-one by one to'th-e receiving hoppers for.corroding lead, and before or when it is above ,these hoppers, the shaft 18 is "manipulated, thus turning hood 10 to its inverted position as indicated by the broken lines 28, (Fig. 2). This permits the corroded lead to drop from the trays 1 into the end of hood 10 in which the doors 20 are located. Then the hood is lowered causing its latch operating arm to engage the side of the hopper and thereby permit the doors to swing to their open position and dump the lead. The hoppers are, of course, so arranged and of such shape that when the lead is dumped therein the edges of the hopper will come in contact with the walls of the hood 10, and thereby prevent the escape of dust. Shaft 18 may be turned at any time after a tray is secured to the hood l0, and therefore it is not necessary for an operator to be stationed near the receiving hopper.

It may be seen that the above described invention while preventing the escape of lead dust in the operation of stripping the corroding stacks and dumping the lead, it also results in improving the product by preventing the lead from coming into contact with the tan-bark or boards of the corroding stacks and also by providing for uniform ventilation of the stacks, and further preventing the lead buckles from dropping into the acetic acid and thereby permitting the lead to become moistened or saturated with the acid and made diflicult to handle in the process of finishing the white lead.

I claim 1. In an apparatus for corroding and drawing lead, the combination of a tray having openings therein, a plurality of corroding pots in said tray, and cooperating projections on said pots and tray for retaining the pots in the tray.

2. In an apparatus for corroding and drawing lead, the combination of a tray having an acid compartment and a lead compartment, and a screen separating said compartments.

3. In an apparatus for corroding and drawing lead, the combination of a tray having separable acid and lead compartments.

4. In an apparatus for corroding and drawing lead, the combination of a tray having separable acid and lead compartments, and a screen separating said compartments.

5. In an apparatus for corroding and drawing lead, the combination of a tray having separable acid and lead compartments, and a screen separating said compartments and secured to said lead compartment.

6. In an apparatus for corroding and drawing lead,the combination of a tray, a plurality of corroding pots secured therein, a plurality of walls extending between the side walls of said tray, and vents in the sides and bottom of said tray.

7. In an apparatus for corroding and drawing lead, the combination of a grating having recessed openings therein, a plurality of corroding pots seated in said openings, said pots having lugs adapted to pass through said recesses whereby when the pots are turned in their seats they may be locked to said grating.

8. In an apparatus for corroding and drawing lead, the combination of a grating having rectangular openings therein, a plurality of circular pots seated in said openings, and lugs on said pots located to pass through the corner portions of the openings and adapted when the pots are turned to coact with the sides of the openings for locking the pots to the grating.

9. In an apparatus for corroding and drawing lead, the combination of a tray having a plurality of acid containers, and means for supporting lead above and out of contact with said containers.

Signed at Chicago this 21st day of April, 1913.

EMIL C. BERSOH.

Witnesses: v

Rnnow RUMMLER, JENNIE BURT.

copiel of thin patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. 0. 1 

